O’Hare took the No. 1 spot, surpassing Hartsfield-Jackson for the first time in four years.

According to the FAA data, O’Hare had more than 903,000 arrivals and departures during 2018. Atlanta’s airport was second, with more than 895,000 arrivals and departures.

O’Hare last held the top spot in 2014.

Last year, O’Hare operations increased 4.2 percent, compared with a 1.8 percent increase in Atlanta. United Airlines is the largest carrier at O’Hare and has been adding more flights from its hub at the Chicago airport to smaller cities throughout the Midwest.

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